program spmd
c
c  program taken from PVM 3.1 Release Notes
c  and User's guide
c
c    Author:     Nilesh Raj
c    Date:       31 August 1994
c    Version:    1.0
c    Language;   FORTRAN-77
c
     implicit none

#include "fpvm3.h"

      integer NPROC,MXPROC
      parameter ( MXPROC=11)
      integer mytid, me, numt, i, info
      integer tids(0:MXPROC)
c
c  enroll in PVM
c
      call pvmfmytid(mytid)
c
c  am I parent or child?
c
      call pvmfparent(tids(0))

      if (tids(0) .lt. 0) then
        tids(0) = mytid
        me = 0

        write(6,'('' Enter total number of nodes (2-10): '',$)')
        read(5,'(i4)')NPROC

c
c  start copies of myself
c
        call pvmfspawn('fspmd',PVMDEFAULT,'*',NPROC-1,tids(1),numt)
        write(6,'('' Number of nodes spawned: '',i4)')numt
        write(6,'('' Tid to be passed around nodes: '',i8)')mytid
c
c  send number of processes to children
c
        call pvmfinitsend(0,info)
        call pvmfpack(INTEGER4,NPROC,1,1,info)
        call pvmfmcast(NPROC-1,tids(1),5,info)       
c
c  send tids array to children
c
        call pvmfinitsend(0,info)
        call pvmfpack(INTEGER4,tids,NPROC,1,info)
        call pvmfmcast(NPROC-1,tids(1),0,info)

      else
c
c  receive NPROC
c 
        call pvmfrecv(tids(0),5,info)
        call pvmfunpack(INTEGER4,NPROC,1,1,info)
c  
c  receive the tids arrays and set me
c
        call pvmfrecv(tids(0),0,info)
        call pvmfunpack(INTEGER4,tids,NPROC,1,info)

        do 10 i=1,NPROC-1
          if (mytid .eq. tids(i)) me=i
 10     continue
      endif

c
c  all NPROC tasks are equal now
c  and can address each other by tids(0) through tids(NPROC-1)
c  for each process me => process number [0-(NPROC-1)]
c
      call dowork(me, tids, NPROC)
      if (me .eq. 0) then
        write(6,'('' Tid successfully passed around all nodes '')')
        write(6,'('' Host: Terminating '')')
      endif
c
c  program finished exit PVM
c
      call pvmfexit(info)
      stop
      end





      
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